Help me on question b

Answer:
The perimeter is 16 cm.
Step-by-step explanation:
If your answer 4,3 is correct, then this is the following steps:
This is an isosceles traingle meaning CB and CA are the same.
5 + 5 + AB = Answer
10 - 4 is 6 so AB is 6 cm
5 + 5 + 6 is 16 cm.